I should add that my impression of various arguments between Techlore guys (e.g. calyx) and strncat/thestinger is their very different views about whether Google is the threat (techlore) or Google is the savior (thestinger). Thestinger seems to always defend google and scoff, turning the arguments towards technical superiority deep in the kernel, and dismissing the google threat model. That's my top-of-the-head impression, I can't back it up right now.
Why does GrapheneOS run only on Google Pixel phones? Super suss if you ask me.
Because Google was founded as a DARPA/CIA operation, and Google is all about spying, control and censorship (google jigsaw). I am HIGHLY suspicious that GrapheneOS would only support Google phones. This maybe made a bit of sense initially if the Google phones had certain new security hardware features that other phones didn't have, and fully documented specs, but at this point that excuse is getting ridiculous. I suspect there is some hardware "watcher" in those things, low enough that you'll never detect or disable it, and they see everything though it. Huawei phones probably have a similar "watcher" that reports back to China.
I think we need another fork of AOSP, geared to run on different hardware from a neutral country: https://en.wikipedia.org/wiki/List_of_mobile_phone_brands_by_country
Discussion
The question here is why would you trust any other phone maker in the world? If google is compomised then everyone is, the only potential unkown is which agency collects the data. However, google provides better hardware and software security features, relative to other phones, and grapheneOS improves on those, and they contribute those back to the android FOSS project.